Ratchet-drill.



'J. R. GILMAN.

BATGHET DRILL.

APPLICATION FILED SEPT. 28, 1908.

Patented A 7,1909.

amen-Cos T all whom it may concern: r I

- urn I s rs PAZEENT neuron.

JAMES GILMAN, or LOUISVILLE, KENTUCKY.

l .RA'ICHET-DRILL.

Specification of Letters fatent.

Patented April 27', 1909.

Application filed September 28, 1908. Serial No. 454,959.

Be it known that I, JAMns R. GILMAN, a

citizen of the United States, residing at Louisville, in the county ofJefferson, State 7 of Kentuck have in ented certain new and usefulImprovements in Ratchet-Drills; and

I do hereby declare the following to he a full,

provision of a ratchet drill. having mechan ism by which a continuousforward rotation 3 of the drill is effected upon the forward stroke andthe back stroke of the operating lever or handle of the drill so thatthe bit will be driven continuously forward into the-work omrated upon.with a more positive andv effective movement.

Another object of the invention is the provision of a ratchet drillwhich. is simple and durable in construction, very effective inoperation and adapted to drive the bit continuously forward on both theforward and backward stroke of the handle thereof.

In the drawings accompanying and forming part of this specification isillustrated one form of embodiment of the invention which to enablethose skilled in theart to practice the invention will be set forth atlength in the following d6SCIl3t1OI1 while the novelty of the inventionwil be included in the claims succeeding said description; However, itis to be understood that changes, variations and modifications may bemade such as come properly within the scope of the claims hereuntoappended without departing from the spirit of the invention. In thedrawings, Figure 1 is a side elevation of the ratchet drill in positionfor drilling. Fig. 2 is a vertical sectional view thereof. Fig. 3 is atransverse sectional view. Fig. 4 is a sectional viewon the line 44 ofFig. 1. Fig. 5 isa frontviewof the ratchet drill with its frontplatepartly broken away.

Similar reference characters indicate corresponding arts throughout theseveral views of the d awings.

In the drawings the ratchet drill comprises a chuck 8 having a centralsquared. tapering socket 9 to receive the end of abit 1O in oneendthereof and formed with an annular flange 11 and with a gear wheel 12having a central shank 13 in rear of the annular flange of the chuck.The said chuck is mounted within a casing 14 having an operating handle15 and which casing is pro- :vided atits front edge with an inwardlydirected annular rim or flange 1.6 and in rear thereof are internal gearteeth 17 which mesh with the teeth of a gear wh'cel 18 journaled upon apin 19 intersecting an opening or space 20 accommodating the gear wheel18 and contained in an annular shell 21 projecting from one side andintegral with a circular plate 22 mounted within the casing. Projectingoutwardly centrally from the plate 22 is a threaded feed screw 23 havingmounted thereon a threaded sleeve 24 formed with a closed beveled end 25to engage a fixed part to hold the bit in working position with thematerial operated upon.

Between the gear wheel 12 and the plate 22 and surrounding the shank 18of the chuck are opposed cones 26 having annular grooves in adjacentfaces to form race-ways 27 in which are disposed ball-bearings 28 tominimize friction during the rotation of the chuck. The said gear wheel18 meshes with the gear wheel 12 formed on the chuck 8 so as toforwardly rotate the bit 10 upon moving the handle 15 in a forwarddirection which is termedthe forward stroke thereof. At a diametricallyopposite point with respect to the opening or space 20 in the shell 21is a further opening or space 29 receiving a dog or pawl 30 the lattermounted upon a pin 81 intersecting the said opening or space 29 andhaving its bearing in the said shell and which dog or pawl 30 isdisposed diagonally within the casing and normally engages the teeth ofthe gear wheel 12 and the internal teeth 17 of the casing so as to lockthe said casing 14 with the gear wheel 12 of the chuck upon manipulatingthe handle 15 to impart a back or return stroke to the drill,

however upon this back or return stroke due to the locked conditionofthe casing with the 21 adjacent the opening or space 29 and its oppositefree end playing against the said dog or pawl.

Detachably secured by fasteners 34 to the casing 14 are front and rearclosing plates 35 and 36 and keyed to the feed screw or threaded screw23 is a gear wheel 37 abutting against the said rear closing plate 36and surrounding the gear wheel 37 is a shell head 38 of an auxiliaryhandle or operating lever 39 and within the shell head 38 is mounted alocking dog 10 to engage the gear wheel 37 so that upon operating theauxiliary handle 39 in one direction will rotate the drill chuck 8 toforwardly advance the bit 10 carried thereby.

To maintain the shell head 38 of the auxiliary lever in a position tosurround and inclose the gear wheel 37 there are provided jam lock nuts11 engaging the threaded screw 23 of the ratchet drill.

In operation the ratchet drill is arranged to cause a continuous forwardmovement of the drill chuck 8 by intermittent, forward and backwardstrokes of the operating lever 15. For instance, when the operatinglever is moved forward to complete a forward stroke the gear wheel 18 isrotated by being in mesh with the internal gear teeth 17 and by thisrotary movement and the said gear wheel 18 enmeshing with the gear wheel12 of the chuck 8 the latter will be caused to rotate in an oppositedirection thereby rotating the bit 10 for cutting action upon the workoperated upon. Now upon manipulating the operating lever or handle 15 tocomplete a back stroke the double acting dog or pawl will automaticallybe brought into locking engagement with the teeth of the gear wheel 12and the internal teeth 17 of the casing 14 so as to lock the latter withthe drill socket 8 to rotate with. the latter and cause a continuousforward feed of the bit 10 into the work operated upon.

hat is claimed is 1. A drill of the class described comprising a casinhavin an o)eratin lever a bit gear and the chuck gear wheel to permitcontinuous rotation in one direction of the chuck upon forward andbackward strokes of the operating lever.

2. A drill of the class described comprising a casing having anoperating lever, a bit chuck mounted within the casing, a gear Wheelformed on the chuck, a plate within the casing and having an annularshell, an internal gear formed on the casing, a gear wheel rotatablysupported by the shell and in mesh with the internal gear and gear wheelon the chuck, a dog engaging the in ternal gear and the chuck gear wheelto permit continuous rotation in one direction of the chuck upon forwardand backward strokes of the operating lever, and feed mechanismprojecting outwardly from the said plate.

In testimony whereof, I ailix my signature, in presence of twowitnesses.

JAMES R. (HIIMAN.

Witnesses:

HENRY ARTER-BUN, JOHN SAMPLE.

